JP5635870B2 - Position detection device using a reflective photosensor - Google Patents

Position detection device using a reflective photosensor Download PDF

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JP5635870B2
JP5635870B2 JP2010237482A JP2010237482A JP5635870B2 JP 5635870 B2 JP5635870 B2 JP 5635870B2 JP 2010237482 A JP2010237482 A JP 2010237482A JP 2010237482 A JP2010237482 A JP 2010237482A JP 5635870 B2 JP5635870 B2 JP 5635870B2
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JP2012088277A (en
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文昭 大野
文昭 大野
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New Japan Radio Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/026—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by measuring distance between sensor and object
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C3/00—Measuring distances in line of sight; Optical rangefinders
    • G01C3/10—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras

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  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optics & Photonics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
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  • Measurement Of Optical Distance (AREA)

Description

本発明は反射型フォトセンサを用いた位置検出装置、特にカメラ等の装置内の可動体（移動物）の位置検出を行うための装置に関する。   The present invention relates to a position detection apparatus using a reflective photosensor, and more particularly to an apparatus for detecting the position of a movable body (moving object) in an apparatus such as a camera.

従来から、例えば各種のカメラ、ズーム機能カメラ付き携帯電話等では、ピエゾモータや、マグネット及びコイルを組み合わせたもの等のアクチュエータを使用してレンズを駆動しており、この可動レンズ等の位置を把握するために位置検出装置（センサ）が用いられる。   Conventionally, for example, in various cameras, mobile phones with zoom function cameras, etc., the lens is driven using an actuator such as a piezo motor or a combination of a magnet and a coil, and the position of this movable lens is grasped. For this purpose, a position detection device (sensor) is used.

上記アクチュエータを使用した５ｍｍ以上の位置検出装置には、例えば下記特許文献１,２のように、ＭＲ素子（磁気抵抗効果素子）やホール素子等の複数の磁気センサ上に、これらの素子を覆う大きさのマグネットを配置するような構成が主流であり、装置自体が大型化していた。また、このような位置検出装置が搭載されるアプリケーション内に他の磁気を使用するような場合には、磁気かぶり等の影響を受け誤動作する可能性があった。   For a position detection apparatus of 5 mm or more using the actuator, for example, as described in Patent Documents 1 and 2 below, these elements are covered on a plurality of magnetic sensors such as MR elements (magnetoresistance effect elements) and Hall elements. A configuration in which a magnet having a size is arranged is the mainstream, and the apparatus itself has been enlarged. Further, when other magnetism is used in an application in which such a position detection device is mounted, there is a possibility of malfunction due to the influence of magnetic fogging.

このようなことから、従来から位置検出装置に反射型フォトセンサを用いて構成する要求があり、従来の反射型フォトセンサを用いた位置検出装置としては、１ｍｍ以下の位置検出を目的として、携帯電話用オートフォーカスレンズ検出用のアクチュエータ等に使用されている。一方、１ｍｍ以上の位置検出を行う場合には、装置が大型化するため実現が困難であった。   For this reason, there has been a demand to construct a position detection device using a reflective photosensor, and a position detection device using a conventional reflection photosensor is portable for the purpose of position detection of 1 mm or less. Used in actuators for detecting autofocus lenses for telephones. On the other hand, when position detection of 1 mm or more is performed, it is difficult to realize the apparatus because the apparatus is enlarged.

特願平１０−２２５０８３号公報Japanese Patent Application No. 10-225083 特願平１１−２８９７４３号公報Japanese Patent Application No. 11-289743

上述のように、ピエゾモータ等のアクチュエータを使用して移動させる物の５ｍｍ以上の位置センシングを行う検出装置は、磁気センサ（ＭＲ素子又はホール素子）と大型マグネットの構成となるため、装置の小型化には難があった。しかも、磁気センサの場合、各センサの出力を、オペアンプを介して又は集積回路内蔵型センサ出力としてＡＤＣ（アナログデジタルコンバータ）に入力しなければならず、システムを構成するための部品コストが高価になるという問題があった。   As described above, the detection device that performs position sensing of an object to be moved by using an actuator such as a piezo motor has a configuration of a magnetic sensor (MR element or Hall element) and a large magnet. There were difficulties. In addition, in the case of a magnetic sensor, the output of each sensor must be input to an ADC (analog / digital converter) via an operational amplifier or as an integrated circuit built-in sensor output, which increases the cost of components for configuring the system. There was a problem of becoming.

また、１ｍｍ以上の位置センシングを反射型フォトセンサ１つで実現しようとする場合、例えばこのフォトセンサの発光素子と受光素子とを結ぶ線方向へ可動体を移動させる構成となり、上記受光素子の検出距離方向（可動体の移動方向）のサイズが検出距離以上に必要となることから、必然的にフォトセンサの外形サイズが大きくなるという問題があった。   In addition, when it is intended to realize position sensing of 1 mm or more with one reflective photosensor, for example, the movable body is moved in a line direction connecting the light emitting element and the light receiving element of the photosensor, and the detection of the light receiving element is performed. Since the size in the distance direction (moving direction of the movable body) is required to be larger than the detection distance, there is a problem that the outer size of the photosensor is necessarily increased.

更に、反射型フォトセンサを用いて位置検出をするとき、その検出出力が温度の変化に応じて変動するという温度特性があり、この温度特性の影響をなくす必要があり、このために、従来では、例えば装置内温度をサーミスタでモニタし、その温度変化分を解消するフィードバック制御回路や反射型フォトセンサの温度特性をキャンセルするための回路を設ける必要があった。   Furthermore, when position detection is performed using a reflection type photosensor, there is a temperature characteristic that the detection output fluctuates according to a change in temperature, and it is necessary to eliminate the influence of this temperature characteristic. For example, it is necessary to provide a feedback control circuit for monitoring the temperature in the apparatus with a thermistor and canceling the temperature change, and a circuit for canceling the temperature characteristics of the reflective photosensor.

本発明は上記問題点に鑑みてなされたものであり、その目的は、磁気センサや大型マグネットを用いることなく、簡単かつ小型な構成で、１ｍｍ以上の位置センシングが良好にでき、反射型フォトセンサの温度特性をキャンセルすることが可能となる反射型フォトセンサを用いた位置検出装置を提供することにある。   The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to satisfactorily sense a position of 1 mm or more with a simple and small configuration without using a magnetic sensor or a large magnet, and a reflective photosensor. It is an object of the present invention to provide a position detection device using a reflection type photosensor that can cancel the temperature characteristic.

上記目的を達成するために、請求項１の発明に係る反射型フォトセンサを用いた位置検出装置は、対向配置された１対の反射型フォトセンサと、この１対のフォトセンサ間に、可動体と一体に移動するように配置された両面反射板と、を設け、上記１対のフォトセンサから対称的な電圧特性の出力を取得し、この出力に基づき上記反射板の移動距離に応じてリニアな値が得られる演算を行うことにより、該フォトセンサ間の上記両面反射板の移動位置を検出することを特徴とする。
請求項２の発明は、上記両面反射板の移動位置は、上記１対のフォトセンサの一方の出力をＶｏ１、他方の出力をＶｏ２とすると、（Ｖｏ１−Ｖｏ２）／（Ｖｏ１＋Ｖｏ２）又は（Ｖｏ１＋Ｖｏ２）／（Ｖｏ１−Ｖｏ２）の演算で求めることを特徴とする。 In order to achieve the above object, a position detecting device using a reflective photosensor according to the invention of claim 1 is movable between a pair of opposed reflective photosensors and the pair of photosensors. A double-sided reflector arranged so as to move integrally with the body, and obtain a symmetrical voltage characteristic output from the pair of photosensors , and based on the output, according to the moving distance of the reflector The movement position of the double-sided reflection plate between the photosensors is detected by performing a calculation to obtain a linear value .
According to a second aspect of the present invention, the moving position of the double-sided reflecting plate is (Vo1-Vo2) / (Vo1 + Vo2) or (Vo1 + Vo2) where Vo1 is one output of the pair of photosensors and Vo2 is the other output. / (Vo1-Vo2) .

上記の構成によれば、例えばカメラの可動レンズに両面反射板を取り付け、この反射板の移動位置を検出することで、可動レンズ等の位置を特定することができる。この反射板の位置検出には、反射板の移動距離に応じてリニアな値が得られ、かつ温度変化による出力の変動をキャンセルする演算式が用いられ、この演算式としては、例えば１対の反射型フォトセンサの一方の出力をＶｏ１、他方の出力をＶｏ２とすると、（Ｖｏ１−Ｖｏ２）／（Ｖｏ１＋Ｖｏ２）の演算式又は（Ｖｏ１＋Ｖｏ２）／（Ｖｏ１−Ｖｏ２）の演算式を用いることができる。 According to the above configuration, for example, the position of the movable lens or the like can be specified by attaching the double-sided reflection plate to the movable lens of the camera and detecting the movement position of the reflection plate. For detecting the position of the reflector, a linear value is obtained according to the moving distance of the reflector, and an arithmetic expression that cancels fluctuations in output due to a temperature change is used. As the arithmetic expression, for example, a pair of When one output of the reflection type photosensor is Vo1 and the other output is Vo2, an arithmetic expression of ( Vo1-Vo2) / (Vo1 + Vo2) or an arithmetic expression of (Vo1 + Vo2) / (Vo1-Vo2) can be used.

本発明の反射型フォトセンサを用いた位置検出装置によれば、対向配置した１対の反射型フォトセンサ間の出力電圧（又は電流）を用い、リニアな距離特性となる演算式を利用することにより、磁気センサや大型マグネットを用いることなく、小型かつ安価で高精度な位置検出が可能となる。そして、デジタルスチールカメラ、ズーム機能カメラ付き携帯電話、一眼レフカメラ、カムコーダー等ズーム機能が必要なカメラモジュールのレンズ位置検出等、１ｍｍ〜１０ｍｍ程度の長距離の位置検出が必要なレンズ駆動用アクチュエータ等に使用できる利点がある。   According to the position detection device using the reflective photosensor of the present invention, the output voltage (or current) between a pair of reflective photosensors arranged opposite to each other is used, and an arithmetic expression having a linear distance characteristic is used. Thus, it is possible to detect the position with a small size, low cost and high accuracy without using a magnetic sensor or a large magnet. And, for example, digital still cameras, mobile phones with zoom functions, single-lens reflex cameras, and camcorders, such as lens position detection for camera modules that require zoom functions, etc. Has advantages that can be used.

また、２つの反射型フォトセンサの出力を利用した演算式を用いることで、反射型フォトセンサの温度特性をキャンセルすることが可能となり、従来の例えばサーミスタでモニタした温度変化分を解消するフィードバック制御回路や反射型フォトセンサの温度特性をキャンセルするための回路等を設ける必要がないという効果がある。   Also, by using an arithmetic expression that uses the outputs of two reflective photosensors, it becomes possible to cancel the temperature characteristics of the reflective photosensor, and feedback control that eliminates the temperature change monitored by a conventional thermistor, for example. There is an effect that it is not necessary to provide a circuit or a circuit for canceling the temperature characteristic of the reflection type photosensor.

本発明の実施例に係る位置検出装置のセンサ部の構成を示す図である。It is a figure which shows the structure of the sensor part of the position detection apparatus which concerns on the Example of this invention. 実施例に係る位置検出装置のセンサ部の回路構成を示す図である。It is a figure which shows the circuit structure of the sensor part of the position detection apparatus which concerns on an Example. 実施例に係る反射型フォトセンサの距離特性を示す特性グラフ図である。It is a characteristic graph figure which shows the distance characteristic of the reflection type photosensor which concerns on an Example. 実施例の演算式を説明するための反射板−反射型フォトセンサ間距離対演算値を示すグラフ図である。It is a graph which shows the calculation value of the distance between reflector-reflective photosensors for demonstrating the computing equation of an Example. 実施例の演算式による反射板−反射型フォトセンサ間距離対演算値を示すグラフ図である。It is a graph which shows the distance between reflector-reflective photosensors versus the operation value by the arithmetic expression of an Example. 実施例に係る位置検出装置のセンサ部及び演算部の回路構成を示す図である。It is a figure which shows the circuit structure of the sensor part of the position detection apparatus which concerns on an Example, and a calculating part.

図１には、本発明の実施例に係る反射型フォトセンサを用いた位置検出装置のセンサ部の構成が示されており、実施例では、１対（２つ）の反射型フォトセンサＰＲｌ、ＰＲ２が対向配置され、この反射型フォトセンサＰＲｌ、ＰＲ２のそれぞれは、発光素子３と受光素子４を有してなる。また、この反射型フォトセンサＰＲｌ、ＰＲ２の間に、反射板（例えば、厚さｔ＝０．５ｍｍ）５が配置されており、この両面反射板５は、表裏両面が同一の反射率を有する両面反射板であり、その面積は反射型フォトセンサＰＲ１，ＰＲ２の対向面の面積よりも大きく形成される。そして、この反射板５は、レンズ等の可動体に接続され、可動体と一体となってフォトセンサ間を移動するように構成される。   FIG. 1 shows a configuration of a sensor unit of a position detecting device using a reflective photosensor according to an embodiment of the present invention. In the embodiment, a pair (two) of reflective photosensors PRl, PR2 is disposed opposite to each other, and each of the reflection type photosensors PRl and PR2 includes a light emitting element 3 and a light receiving element 4. A reflective plate (for example, thickness t = 0.5 mm) 5 is disposed between the reflective photosensors PRl and PR2, and the double-sided reflective plate 5 has the same reflectance on both the front and back sides. It is a double-sided reflector, and its area is formed larger than the area of the opposing surface of the reflective photosensors PR1, PR2. The reflector 5 is connected to a movable body such as a lens, and is configured to move between the photosensors together with the movable body.

図２には、センサ部の回路構成が示されており、図示されるように、反射型フォトセンサＰＲ１は、抵抗Ｒ１、発光素子（フォトダイオード）３、受光素子（フォトトランジスタ）４、抵抗Ｒ２を有してなり、電圧Ｖｏ１（電流でもよい）を出力する。また、反射型フォトセンサＰＲ２も、同様に抵抗Ｒ３、発光素子３、受光素子４、抵抗Ｒ４を有してなり、電圧Ｖｏ２を出力するように構成される。 FIG. 2 shows a circuit configuration of the sensor unit. As shown, the reflective photosensor PR1 includes a resistor R 1 , a light emitting element (photodiode) 3, a light receiving element (phototransistor) 4, and a resistor. It becomes a R 2, and outputs a voltage Vo1 (or a current). The reflection-type photosensor PR2 likewise resistor R 3, the light-emitting element 3, the light receiving element 4, it has a resistance R 4, configured to output a voltage Vo2.

図３には、図１及び図２に示される反射型フォトセンサＰＲ１とＰＲ２の間の両面反射板５を０ｍｍ〜８ｍｍまで移動させたときの反射型フォトセンサＰＲ１とＰＲ２の出力電圧Ｖｏ１,Ｖｏ２が示されており、ＰＲ１からの距離ｄにおいて、このＰＲ１の出力電圧Ｖｏ１は、高い電圧から急激に降下する電圧となり、他方のＰＲ２の出力電圧Ｖｏ２は、低い電圧から急激に上昇する電圧となり、それぞれの電圧特性は対称的なものとなる。   FIG. 3 shows output voltages Vo1 and Vo2 of the reflection type photosensors PR1 and PR2 when the double-sided reflection plate 5 between the reflection type photosensors PR1 and PR2 shown in FIGS. 1 and 2 is moved from 0 mm to 8 mm. In the distance d from PR1, the output voltage Vo1 of PR1 becomes a voltage that suddenly drops from a high voltage, and the output voltage Vo2 of the other PR2 becomes a voltage that suddenly rises from a low voltage, Each voltage characteristic is symmetrical.

図４は、図３で説明した反射型フォトセンサＰＲ１の出力電圧とＰＲ２の出力電圧の加算（Ｖｏ１＋Ｖｏ２）及び減算（Ｖｏ１−Ｖｏ２）の処理を行った結果である。   FIG. 4 shows a result of performing the addition (Vo1 + Vo2) and subtraction (Vo1-Vo2) processing of the output voltage of the reflective photosensor PR1 and the output voltage of PR2 described in FIG.

図５には、更に、（Ｖｏ１−Ｖｏ２）／（Ｖｏ１＋Ｖｏ２）［演算式Ａ］の演算処理を行った結果が示されており、図示のように、この演算式Ａによれば、点線で示す理想直線に近似する直線性が高いリニアな特性が得られることが理解される。また、検出のための演算式としては、（Ｖｏ１＋Ｖｏ２）／（Ｖｏ１−Ｖｏ２）［演算式Ｂ］を用いてもよく、この演算式Ｂの特性線は、図５の傾きとは逆に右肩上がりとなるが、この場合も、上記と同様に反射板の移動距離ｄに応じて理想直線に近似する高いリニア特性が得られる。更に、上記の演算式Ａ,Ｂは、後述するが、反射型フォトセンサＰＲ１,ＰＲ２の温度特性により出力値が変動した場合でも、その変動分をキャンセルできるものである。   FIG. 5 further shows the result of the calculation processing of (Vo1−Vo2) / (Vo1 + Vo2) [Calculation Formula A]. As shown in FIG. 5, this calculation formula A is indicated by a dotted line. It is understood that a linear characteristic with high linearity approximating an ideal straight line can be obtained. Further, as an arithmetic expression for detection, (Vo1 + Vo2) / (Vo1−Vo2) [calculation expression B] may be used, and the characteristic line of the arithmetic expression B is on the right side of the slope of FIG. In this case as well, a high linear characteristic that approximates an ideal straight line is obtained in accordance with the moving distance d of the reflecting plate as described above. Furthermore, although the arithmetic expressions A and B will be described later, even if the output value fluctuates due to the temperature characteristics of the reflective photosensors PR1 and PR2, the fluctuation can be canceled.

図６には、演算部を含めた位置検出装置の構成が示されており、この演算部７は、検出部からの出力電圧Ｖｏ１,Ｖｏ２を入力するＡＤＣ（アナログデジタルコンバータ）８ａ,８ｂ、Ｖｏ１＋Ｖｏ２を演算する加算器９、Ｖｏ１−Ｖｏ２を演算する減算器１０、（Ｖｏ１−Ｖｏ２）／（Ｖｏ１＋Ｖｏ２）又は（Ｖｏ１＋Ｖｏ２）／（Ｖｏ１−Ｖｏ２）を演算する割算器１１からなる。   FIG. 6 shows a configuration of a position detection device including a calculation unit, and this calculation unit 7 includes ADCs (analog / digital converters) 8a and 8b for inputting output voltages Vo1 and Vo2 from the detection unit, Vo1 + Vo2. The subtractor 10 calculates Vo1-Vo2, and the divider 11 calculates (Vo1-Vo2) / (Vo1 + Vo2) or (Vo1 + Vo2) / (Vo1-Vo2).

このような構成によれば、図１の移動する反射板５に対し、１対の反射型フォトセンサＰＲ１,ＰＲ２のそれぞれの発光素子３から検出光が出力されると、反射板５から反射される光がそれぞれの受光素子４で受光され、フォトセンサＰＲ１から電圧Ｖｏ１、フォトセンサＰＲ２から電圧Ｖｏ２が出力される。そして、これらアナログ電圧値は、ＡＤＣ８ａ,８ｂでデジタル値に変換され、これらのデジタル値を入力する加算器９、減算器１０及び割算器１１によって、例えば（Ｖｏ１−Ｖｏ２）／（Ｖｏ１＋Ｖｏ２）［演算式Ａ］が演算される。そして、この演算値によって、図５に示される特性に基づいて、反射板５の位置（距離ｄ）、即ち可動体の位置が良好に検出されることになる。   According to such a configuration, when detection light is output from each light emitting element 3 of the pair of reflective photosensors PR1 and PR2 to the moving reflecting plate 5 in FIG. Are received by the respective light receiving elements 4, and the voltage Vo1 is output from the photosensor PR1, and the voltage Vo2 is output from the photosensor PR2. These analog voltage values are converted into digital values by the ADCs 8a and 8b, and, for example, (Vo1−Vo2) / (Vo1 + Vo2) [ The arithmetic expression A] is calculated. Then, based on the calculated value, the position (distance d) of the reflecting plate 5, that is, the position of the movable body is detected satisfactorily based on the characteristics shown in FIG.

上記実施例は、ピエゾモータを組み込んだ位置検出装置等として、例えばデジタルスチールカメラ、ズーム機能カメラ付き携帯電話、一眼レフ、カムコーダー等ズーム機能か必要なカメラモジュールのレンズ位置検出装置等に使用することができ、これらの１ｍｍ以上の位置センシング等において、小型化ができ、かつ安価なシステム構成が実現できるという利点がある。   The above embodiment can be used as a position detecting device incorporating a piezo motor, for example, a digital still camera, a mobile phone with a zoom function camera, a single lens reflex camera, a camcorder, etc. In these position sensing of 1 mm or more, etc., there is an advantage that a downsizing and an inexpensive system configuration can be realized.

また、反射型フォトセンサＰＲ１,ＰＲ２の温度特性に基づき、出力電圧が温度により変化したとき、２つのフォトセンサ出力に基づいた上記の加減算及び割算の処理によれば、その変動分が完全にキャンセルされる。例えば、温度の影響がなく、Ｖｏ１＝０．４（Ｖ）、Ｖｏ２＝０．１（Ｖ）であるとき、上記演算式Ａによる値は０．６となるが、これに対し、温度の影響により１割の変動があったとすると、Ｖｏ１＝０．４４、Ｖｏ２＝０．１１となるが、この場合も、演算値は０．６となり、変動分がキャンセルされている。従って、装置内温度をサーミスタでモニタしフィードバックをかける回路や、反射型フォトセンサの温度特性をキャンセルするための回路等を設ける必要がない。   Also, when the output voltage changes with temperature based on the temperature characteristics of the reflective photosensors PR1 and PR2, the above addition / subtraction and division processing based on the two photosensor outputs completely eliminates the fluctuation. Canceled. For example, when there is no influence of temperature and Vo1 = 0.4 (V) and Vo2 = 0.1 (V), the value according to the arithmetic expression A is 0.6. Therefore, Vo1 = 0.44 and Vo2 = 0.11. In this case, the calculated value is 0.6, and the fluctuation is cancelled. Therefore, there is no need to provide a circuit for monitoring the temperature in the apparatus with a thermistor for feedback and a circuit for canceling the temperature characteristics of the reflective photosensor.

ＰＲ１,ＰＲ２…反射型フォトセンサ、
３…発光素子、 ４…受光素子、
５…反射板、 ７…演算部、
８ａ，８ｂ…ＡＤＣ。 PR1, PR2 ... reflective photosensors,
3 ... light emitting element, 4 ... light receiving element,
5 ... reflector, 7 ... arithmetic unit,
8a, 8b ... ADC.

Claims (2)

対向配置された１対の反射型フォトセンサと、
この１対のフォトセンサ間に、可動体と一体に移動するように配置された両面反射板と、を設け、
上記１対のフォトセンサから対称的な電圧特性の出力を取得し、この出力に基づき上記反射板の移動距離に応じてリニアな値が得られる演算を行うことにより、該フォトセンサ間の上記両面反射板の移動位置を検出することを特徴とする反射型フォトセンサを用いた位置検出装置。 A pair of reflective photosensors arranged opposite to each other;
A double-sided reflector disposed between the pair of photosensors so as to move integrally with the movable body ,
An output having a symmetrical voltage characteristic is obtained from the pair of photosensors , and a calculation is performed on the basis of the output to obtain a linear value in accordance with the moving distance of the reflecting plate. A position detection device using a reflection type photosensor, wherein the movement position of a reflection plate is detected. 上記両面反射板の移動位置は、上記１対のフォトセンサの一方の出力をＶｏ１、他方の出力をＶｏ２とすると、（Ｖｏ１−Ｖｏ２）／（Ｖｏ１＋Ｖｏ２）又は（Ｖｏ１＋Ｖｏ２）／（Ｖｏ１−Ｖｏ２）の演算で求めることを特徴とする請求項１記載の反射型フォトセンサを用いた位置検出装置。 The moving position of the double-sided reflector is (Vo1-Vo2) / (Vo1 + Vo2) or (Vo1 + Vo2) / (Vo1-Vo2), where Vo1 is one output of the pair of photosensors and Vo2 is the other output. 2. The position detection device using a reflection type photosensor according to claim 1, wherein the position detection device is obtained by calculation.
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